ColourPop Piece of Me is a warm mauve with a pearl finish that is limited edition and retails for $4.50. In comparison, MAC Tide 'n' Seek (Magic in Your Eyes) is a cool taupe with a metallic finish that is limited edition and retails for $20.00.
MAC Tide 'n' Seek (Magic in Your Eyes) is 90% similar — it is more shimmery, darker.